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#!/bin/sh
# @(#)util/mkhpath.sh 1.2 24 Oct 1990 05:26:31
#
# Copyright (C) 1988 Ronald S. Karr and Landon Curt Noll
#
# See the file COPYING, distributed with smail, for restriction
# and warranty information.
# mkhostpath - build a pathalias database from a 'hosts' table
#
# Usage: mkhostpath [-n netname] [-c cost] [-g gateway] [-d] [ - | filename ]
#
# -n netname - form a map (not pathalais output) name the net netname
# -c cost - set cost to gateway, or network is no gateway
# -g gateway - set the gateway for hosts to be gateway
# -d - only print lines that has domain hostnames
# - - read hosts table from stdin
# filename - read hosts table from filename
# <no arg> - read hosts from /etc/hosts
#
# The mkhostpath(8) command reads a hosts table from 'filename' or
# standard input if '-' is used, and constructs routes to that network.
# The hosts table is assumed to be in the format of the /etc/hosts
# database file. That is, the first field (internet address) and any,
# domain based name (field containing a '.') are ignored. The hosts
# 'localhost' and 'loghost' are also ignored. Comment lines, beginning
# with a '#', and blank lines are also ignored. If '-d' is specified
# and address does NOT contain an alias that is a domain based name,
# then that line is ignored. (useful to ignore test lines)
#
# By default, mkhostpath(8) builds route table to the network in the format
# of the output of pathalias(8) with the '-i' option. The '-n' network flag
# overrides this default.
#
# If a gateway is specified with the '-g' option, but the '-n' network
# option is not used, then all routes to the network (except for the route
# to the gateway) are prepended with the route "gateway!". A route to from
# the localhost to the gateway is explicitly formed.
#
# If neither the '-g' gateway nor the '-n' network options are given,
# then direct routes from the localhost to each host are constructed.
#
# The mkhostpath command will build a pathalias map to the network if the
# name of the network is given via the '-n' option. The construction of
# the map depends on if the '-g' gateway option is given.
#
# When the '-g' gateway and the '-n' network options are both used, then a
# route from the localhost to the gateway is established, and the gateway is
# inserted into the network list. The localhost is not added to
# the network list, even if it appears as a sitename in the hosts table.
# The cost of the link between the localhost and the gateway is 'LOCAL',
# unless overridden by the '-c' cost option. The cost of routes inside
# the network is fixed at 'LOCAL' and is not changed by the '-c' cost option.
#
# If no gateway is specified with the '-n' network option, then it is
# assumed that the localhost is in the network and thus the localhost
# is inserted into the network list. The cost of routes inside the network
# is assumed to be 'LOCAL', unless changed by the '-c' cost option.
#
# The value of the '-c' option may be any valid pathalias(8) cost expression.
# The '-c' flag is ignored if the '-n' flag is not given.
# base directory for smail library/utility
#
# These directories should be owned by root, and only writeable by root
#
PATH="X_UTIL_PATH_X:X_SECURE_PATH_X"
UTIL_BIN_DIR=X_UTIL_BIN_DIR_X
TMPDIR=X_TMP_DIR_X
# standard locations
#
DCASEHOST=dcasehost
SORT=sort
HOSTS=/etc/hosts
SMAIL=X_SMAIL_NAME_X
# find out who we are
hostname="`$SMAIL -bP uucp_name`"
# parse - need public domain getopt - XXX
#
gateway=
gate=
GATE=0
netname=
cost=LOCAL
dotline=0
PROG=$0
set -- `getopt -n $PROG -q n:c:g:d $*`
if [ "$?" -ne 0 ]; then
echo "usage: $PROG [-n netname] [-c cost] [-g gateway] [-d] [- | filename]" 2>&1
exit 1
fi
for i in $*; do
case "$i" in
-g) gate="$2"; gateway="$gate!"; GATE=1; shift 2;;
-n) netname="$2"; shift 2;;
-c) cost="$2"; shift 2;;
-d) dotline=1; shift;;
--) shift; break;;
esac
done
# select where input is to come from
#
if [ "$#" -eq 1 ]; then
case "$1" in
-) cat ;; # `-' then stdin
*) cat "$1" ;; # filename then that file
esac
else
cat $HOSTS # no argument then /etc/hosts
fi |
sed 's/[ ]*#.*$//' | # strip #-style comments
if [ -z "$netname" ]; then
# pathalias style output
# Make entries for lines which contain more than just an
# initial inet address, localhost or loghost
awk 'NF > 1 {
if (DOTLINE == 1) {
found = 0;
for (i = 2; i <= NF && found == 0; ++i) {
if ($i ~ /\./) {
found = 1;
}
}
if (found == 0) {
continue;
}
}
for (i = 2; i <= NF; i++) {
if ($i !~ /\./ && $i != "'$hostname'" && $i != "localhost" && $i != "loghost" && $i != "'$gate'") {
if (length($i) < 8) {
tab = "\t\t";
} else {
tab = "\t";
}
if (GATE > 0) {
print $i tab "'$gate'!"$i"!%s";
} else {
print $i tab $i"!%s";
}
}
if ($i == "'$hostname'") {
if (length($i) < 8) {
tab = "\t\t";
} else {
tab = "\t";
}
print $i tab "!%s 0";
}
}
}
END {
if (GATE > 0) {
if (length("'$gate'") < 8) {
tab = "\t\t";
} else {
tab = "\t";
}
print "'$gate'" tab "'$gate'!%s";
}
}' GATE="$GATE" DOTLINE=$dotline - | $DCASEHOST | $SORT -u -T $TMPDIR
else
# output in the format of pathalias map input
# output the initial map data
echo "file { [mkhostpath] }"
if [ "$GATE" -gt 0 ]; then
echo "$hostname $gate($cost)"
# the gateway will be the first listed site
first_site="$gate";
else
first_site="$hostname";
fi
# Make entries for lines which contain more than just an
# initial inet address, localhost or loghost. Force the
# first_site to be first in the list.
awk 'BEGIN {
line = "'$netname' = { '$first_site'";
line_len = length(line);
}
NF > 1 {
if (DOTLINE == 1) {
found = 0;
for (i = 2; i <= NF && found == 0; ++i) {
if ($i ~ /\./) {
found = 1;
}
}
if (found == 0) {
continue;
}
}
for (i = 2; i <= NF; i++) {
if ($i !~ /\./ && $i != "localhost" && $i != "loghost" && $i != "'$first_site'" && $i != "'$hostname'") {
field_len = length($i);
if (field_len+line_len > 76) {
print line",";
line = " "$i;
line_len = 4 + field_len;
} else {
line = line", "$i;
line_len += field_len + 2;
}
}
}
}
END {
line2 = " }(LOCAL)";
field_len = length(line2);
if (field_len+line_len > 76) {
print line;
print " " line2;
} else {
print line line2;
}
}' GATE="$GATE" DOTLINE=$dotline -
fi
exit 0
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